NEET Chemistry Groups 15 16 17 and 18 NEET s MCQ Questions - Practice Now

Question 1

Given below are two statements

Statement I :The boiling points of the following hydrides of group 16 elements increase in the order –

$H_2O

Statement II The boiling points of these hydrides increase with the increase in molar mass.

In the light of the above statements, choose the most appropriate answer from the options given below :

Accepted Answer

Both Statement I and Statement II are incorrect

Answer

Both Statement I and Statement II are correct

Answer

Statement I is correct but Statement II is incorrect

Answer

Statement I is incorrect but Statement II is correct.

Question 2

Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R).

Assertion (A): $\mathrm{ICl}$ is more reactive than $\mathrm{I_2}$.

Reason (R):$\mathrm{I-Cl}$ bond is weaker than $\mathrm{I-I}$ bond.

In the light of the above statements, choose the most appropriate answer from the options given below:

Accepted Answer

Both (A) and (R) are correct and (R) is the correct explanation of (A).

Answer

Both (A) and (R) are correct but (R) is not the correct explanation of (A).

Answer

(A) is correct but (R) is not correct.

Answer

(A) is not correct but (R) is correct.

Question 3

The correct sequence of bond enthalpy of ${\mathrm{ 'C − X' }}$ bond is :

Accepted Answer

${\mathrm{CH_3 − F \gt CH_3 − Cl \gt CH_3 − Br \gt CH_3 − I}}$

Answer

${\mathrm{CH_3 − F \gt CH_3 − Cl \gt CH_3 − Br \gt CH_3 − I}}$

Answer

${\mathrm{CH_3 − F \gt CH_3 − Cl \gt CH_3 − Br \gt CH_3 − I}}$

Answer

${\mathrm{CH_3 − F \gt CH_3 − Cl \gt CH_3 − Br \gt CH_3 − I}}$

Question 4

Statement I : Acid strength increases in the order given as ${\mathrm{HF \lt \lt HCl \lt \lt HBr \lt \lt HI}}$

Statement II : As the size of the elements ${\mathrm{F, Cl, Br, I}}$ increases down the group, the bond strength of ${\mathrm{HF,HCl, HBr }}$ and ${\mathrm{HI}}$ decreases and so the acid strength increases.

In the light of the above statements, choose the correct answer from the options given below.

Accepted Answer

Both Statement I and Statement II are true

Answer

Both Statement I and Statement II are false

Answer

Statement I is correct but Statement II is false

Answer

Statement I is incorrect but Statement II is true

Question 5

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

Accepted Answer

Noble gases have very high melting and boiling points

Answer

Noble gases have weak dispersion forces

Answer

Noble gases have large positive values of electron gain enthalpy

Answer

Noble gases are sparingly soluble in water

Question 6

Which of the following species contains three bond pairs and one lone pair around the central atom?

Accepted Answer

$\mathrm {PCl_3}$

Answer

$\mathrm {PCl_3}$

Answer

$\mathrm {PCl_3}$

Answer

$\mathrm {PCl_3}$

Question 7

Which of the following oxoacid of sulphur has $\mathrm{-O-O-}$ linkage?

Accepted Answer

$\mathrm {PCl_3}$ , peroxodisulphuric acid

Answer

$\mathrm {PCl_3}$ , sulphuric acid

Answer

$\mathrm {PCl_3}$ , pyrosulphuric acid

Answer

$\mathrm {PCl_3}$ , sulphurous acid

Question 8

Roasting of sulphides give the gas X as by product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is

Accepted Answer

$\mathrm {PCl_3}$

Answer

$\mathrm {PCl_3}$

Answer

$\mathrm {PCl_3}$

Answer

$\mathrm {PCl_3}$

Question 9

Match the compounds of $\mathrm{Xe}$ in column I with the molecular structure in column II.

Column I	Column 11
(a) $\mathrm{XeF_2}$	(i) square planar
(b) $\mathrm{XeF_4}$	(ii) Linear
(c) $\mathrm{XeO_3}$	(iii) Square pyramidal
(d) $\mathrm{XeOF_4}$	(iv) Pyramidal

Accepted Answer

(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Answer

(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)

Answer

(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

Answer

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

Question 10

Strong reducing behaviour of $\mathrm {H_3PO_2}$ is due to

Accepted Answer

Presence of one -OH group and two P-H bonds

Answer

High oxidation state of phosphorus

Answer

Presence of two -OH groups and one P-H bond

Answer

High electron gain enthalpy of phosphorus

chemistry-neet / groups-15-16-17-and-18-neet-mcqs

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